﻿<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>无标题页</title>
    <style type="text/css">
    .day
    {
    	background-color:White;
    }
    .night
    {
    	background-color:Black;
    }
    </style>
</head>
<body>
<div id="divTest" class="day">
    <p><font color="red">fsfsdfsdfe</font></p>
</div>
<input type="button" value="黑夜" onclick="document.getElementById('divTest').className='night';"/>
<input type="button" value="白天" onclick="document.getElementById('divTest').className='day';"/>
</body>
</html>
